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<html lang="en">
<head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> #div0 { width: 100px; height: 500px; }
#div0 div { float: left; height: 200px }
/* 一行三个 div */ @media screen and (min-device-width: 400px) and (max-device-width: 500px) { #div0 div { width: 33.3%; }
#div0 div:nth-child(1) { background-color: aqua; }
#div0 div:nth-child(2) { background-color: red; }
#div0 div:nth-child(3) { background-color: green; } }
/* 两行三个 div */ @media screen and (min-device-width: 300px) and (max-device-width: 399px) { #div0 div { width: 50%; }
#div0 div:nth-child(1) { background-color: aqua; }
#div0 div:nth-child(2) { background-color: red; }
#div0 div:nth-child(3) { background-color: green; } }
/* 三行三个 div */ @media screen and (min-device-width: 200px) and (max-device-width: 299px) { #div0 div { width: 100%; }
#div0 div:nth-child(1) { background-color: aqua; }
#div0 div:nth-child(2) { background-color: red; }
#div0 div:nth-child(3) { background-color: green; } } </style></head>
<body> <div id="div0"> <div></div> <div></div> <div></div> </div></body>
</html>
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